10 files declare their use of FeedsParserResult in Feeds 8.2

FeedsCSVParser.php in lib/Drupal/feeds/Plugin/feeds/parser/FeedsCSVParser.php

Contains the FeedsCSVParser class.

FeedsNodeProcessor.php in lib/Drupal/feeds/Plugin/feeds/processor/FeedsNodeProcessor.php

Contains \Drupal\feeds\Plugin\feeds\fetcher\FeedsNodeProcessor.

FeedsParser.php in lib/Drupal/feeds/Plugin/FeedsParser.php

Contains FeedsParser and related classes.

FeedsProcessor.php in lib/Drupal/feeds/Plugin/FeedsProcessor.php

Contains FeedsProcessor and related classes.

FeedsSimplePieParser.php in lib/Drupal/feeds/Plugin/feeds/parser/FeedsSimplePieParser.php

Contains FeedsSimplePieParser and related classes.

FeedsSitemapParser.php in lib/Drupal/feeds/Plugin/feeds/parser/FeedsSitemapParser.php

Contains FeedsSitemapParser and related classes.

FeedsSyndicationParser.php in lib/Drupal/feeds/Plugin/feeds/parser/FeedsSyndicationParser.php

Contains \Drupal\feeds\Plugin\feeds\parser\FeedsSyndicationParser.

FeedsTermProcessor.php in lib/Drupal/feeds/Plugin/feeds/processor/FeedsTermProcessor.php

FeedsTermProcessor class.

FeedsUserProcessor.php in lib/Drupal/feeds/Plugin/feeds/processor/FeedsUserProcessor.php

FeedsUserProcessor class.

taxonomy.inc in mappers/taxonomy.inc

On behalf implementation of Feeds mapping API for taxonomy.module.